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I have a ZyXEL NSA310 NAS device on my network that I use for backups (as well as a media server). I have been very happy with it as, amongst other things, it has a gigabit Ethernet connection. I recently upgraded my home laptop from Win7 Pro to Win8
Pro. Under Win7 the NAS device worked perfectly as the backup target. I could back up file sets and - most importantly to me - create a system image on the device should I need to restore the system in the event of a full disk failure.

When I upgraded to Win8 it kept the Win7 settings and it looked like it was just going to work, then as it came to create the system image it failed with error code 0x807800C5 and message "The version does not support this version of the file format".

I have searched the internet and seen that others have had similar issues on Win7 and Win8 with NAS devices where they have had to hack the device to get it working - though it isn't clear that this has been successful for everyone. This isn't an option
for me as the NSA310 is a closed device and in any event I don't see why I should have to hack the device when clearly this is a Win8 issue (since Win7 worked perfectly).

Does anyone have any ideas how to fix this issue so that I can create the full backups I require?

Thanks,
Phil

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Event Log messages:

Log Name: Application
Source: Microsoft-Windows-Backup
Date: 13/01/2013 23:14:52
Event ID: 517
Task Category: None
Level: Error
Keywords:
User: SYSTEM
Computer: Home-Laptop
Description:
The backup operation that started at '‎2013‎-‎01‎-‎13T23:13:43.523158000Z' has failed with following error code '0x807800C5' (There was a failure in preparing the backup image of one of the volumes in the backup set.). Please review the event details for a
solution, and then rerun the backup operation once the issue is resolved.

However, the point is that "Windows 7 File Recovery" worked perfectly well under Windows 7 with this network device, but Windows 8 has broken it. It needs to be fixed in Windows, or at least I need a usable workaround.

I read somewhere that Windows 8 "Windows 7 File Recovery" backups use the new VHDX format for system image backups? If this is causing the problem is there a way to use the old VHD format? I don't need an image backup of >2Tb, my HDD is
only 0.5Tb.

I'm having the EXACTLY the same issue with an IOmega storcenter ix2-200 that used to work perfectly under Windows 7 Pro. What is most infuriating is that the backup control panel correctly solicits the NAS directory and looks like it is going to work before
failing as described.

For a workaround, if your NAS device supports the creation of an iSCSI target then this can be mounted as a local disk and appears to work around the file format/block size issues with direct use of a NAS as a backup destination. Just remember that after
you have created the iSCSI target on your NAS drive (using its setup procedures) and made it visible as an iSCSI portal (using windows iSCSI initiator setup) that you still have to use windows' disk management tools to format it and create a volume the
same way as if you had attached a new unformatted HDD. It can then be used as a viable backup destination for the windows 7 file recovery tools in windows 8.

This workaround appears to work fine on my IOMega storcenter ix2-200 so I hope it works for your ZyXEL device. I have not done an A/B performance comparison of NAS versus iSCSI, but subjectively it appears to be about the same.

Thanks willis! I will look into the iSCSI route. A quick Google search and I can see some mention of the NSA310 and iSCSI so maybe it does support it.

One question: Have you ever attempted to restore a system image from a NAS iSCSI device with a Win8 Restore Disk? Is it easy? I just want to be sure that it is possible to do so in case the worst happens and I need to restore the entire image onto a
new disk.

Hopefully Microsoft will fix the issue with the standard NAS setup with an update in the future, but I don't want to wait for it.

Thanks willis! I will look into the iSCSI route. A quick Google search and I can see some mention of the NSA310 and iSCSI so maybe it does support it.

One question: Have you ever attempted to restore a system image from a NAS iSCSI device with a Win8 Restore Disk? Is it easy? I just want to be sure that it is possible to do so in case the worst happens and I need to restore the entire image onto a
new disk.

Hopefully Microsoft will fix the issue with the standard NAS setup with an update in the future, but I don't want to wait for it.

Thanks again,
Phil

Hi Phil, No I have not had to do this yet, but I see no reason why it shouldn't work as the iSCSI disk looks just like a regular hard disk to the OS. I agree that Microsoft should fix the direct NAS support as the iSCSI approach does have the downside
of dedicating a fixed chunk of your NAS drive to the iSCSI disk that you have to choose when you create the disk whereas the direct NAS just uses the actual space currently needed by the backup. Also I had some trouble getting authentication (access rights)
to work so I left the iSCSI portal as open access - which is OK for a home solution but not a good idea in general. I will revisit this for my own setup and see if I can get it working but just wanted to mention it in case you have the same issue. It manifests
itself as not being able to connect to the iSCSI portal due to failed authentication when running iSCSI initiator setup.

I'm having the same issue but, interestingly, I'm backing up to a NTFS hard drive that is connected by USB 2.0 to my NAS as extended storage. When I connect the drive by USB directly to the computer the image backup completes without error.
When I connect through the NAS I get the same error you got. Obviously, the issue is not the drive format or even the backup file format but maybe something to do with the MTU size or other communication parameter in the NAS. Any thoughts anyone?

So, I've been saving my Windows image backups regularly to my iSCSI disk, everything working nicely. But now when I need it, I can't find any way to open the iSCSI drive from within the Win8 Restore Disk environment. I'm working to copy the entire image
to an external USB drive that is recognized by the Restore Disk environment, but any suggestions out there as to how to open iSCSI connection within Restore Disk environment?

Have the same problem with W8Pro. Never had this issue on my Homeserver, but i'll needed to switchs to another solution because the hardware did not support the 3TB disk i'll bought. So i'll went for the NAS solution.

When you disable in the backup settings the backup of the System partition and EFI then you backup will be succesfull. This is not what you want, but with the buildin backup tooling from W8 the only solution on this moment to backup the lokal drives and
settings to youre NAS solution. So be aware you can't recover by a full diskcrash with the DVD ore USBkey W8recoversolution.

Hope the NAS builders and Microsoft can fix this issue for there customers.

I am having the exact same problem with Win 8.1 Pro and my Ready NAS Duo, which like many of your NAS devices worked fine under Win7 Pro. Why does Microsoft seem determined to make life more difficult for us, and then abandon us on the forums?
Help!

I can't use file history because I have hundreds of thousands of files which would take a century to transfer over WiFi file by file due to the latency so I thought I could at least make a full backup to my NAS (I can copy large files over WiFi with acceptable
200Mbps).

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